Hmm; I have been running extremely large projects on AS with a good but not out of this world machine.
Compilation times are too slow for my taste (ie even clean should take less than 5 seconds ideally), but the IDE itself is pretty smooth.
Again, the trick is to monitor its memory usage.
It is a pity that it's up to the user to configure this, but for large projects I had to allocate more memory to AS and it makes it go from unusable to lag free.
No, no, your English is fine, it's AS that's the problem. :-) I assumed that it was probably a typo of some sort, but I would truly have believed either usage. Though AS has gotten better about not trashing memory.
That said, I agree that with a properly provisioned machine, AS does well. And it's a vast improvement over its predecessor.